import type seedrandom from "seedrandom";
/**
 * Utitilies for generating [[IRuntime.replicaID]]s.
 */
export declare class ReplicaIDs {
    private constructor();
    /**
     * Characters used for generated replicaIDs: the base64 chars.
     */
    static readonly CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    /**
     * The default length of a replicaID, in characters.
     */
    static readonly DEFAULT_LENGTH = 10;
    /**
     * Returns a cryptographically random replicaID made of base64 characters.
     */
    static random(length?: number): string;
    /**
     * Returns a pseudorandom replicaID made of base64 characters
     * generated from `rng` (npm package "seedrandom").
     *
     * For tests and benchmarks, it is recommended to use such a
     * replicaID with a fixed seed. You can supply the replicaID
     * to [[CRuntime]] using its `options.debugReplicaID` constructor
     * arg.
     */
    static pseudoRandom(rng: seedrandom.prng, length?: number): string;
}